Measurement invariance refers to the extent to which a measure or scale maintains its consistency and meaning across different groups, contexts, or time periods. It is important in research because it ensures that the construct being measured is understood and interpreted the same way by all individuals or groups being studied. Measurement invariance is typically assessed through statistical tests that compare the measurement structure of a scale across different groups or conditions. This allows researchers to determine whether the scale is measuring the same underlying construct in a comparable manner across different groups or conditions. Achieving measurement invariance is essential for making valid comparisons and drawing accurate conclusions from research findings.